Technical Specifications Breakdown
Key parameters for the 1790-8BV8VX are listed below for quick reference:
| Feature | Specification |
|---|---|
| Inputs per block | 8 points nonisolated, sinking or sourcing |
| On-state voltage | 9.6V dc min, 24V dc nom, 28.8V dc max |
| On-state current | 8 mA max per point @ 28.8V dc |
| Input impedance, nom | 4.8 KΩ |
| Outputs per block | 8 points nonisolated, sinking |
| Output current rating | 0.5 A max per output, 4.0 A max per common |
| Field power supply voltage | 24V dc nom, range 10…28.8V dc |
| Isolation voltage | 1250V ac rms (I/O to logic) |
| Wiring | 37-pin D-shell connector |
Industry Applications
The 8 universal inputs accept both sinking and sourcing signals, simplifying integration with existing sensors. The 8 sinking outputs drive small solenoids, relays, or indicator lights directly. In automotive assembly stations, the 1790-8BV8VX reduces point-to-point wiring by consolidating I/O at the machine zone, lowering installation costs and troubleshooting time.
Installation and Setup Guidance
Mount the base module on a standard DIN rail within the specified voltage range (11…28.8V DC for DeviceNet power, 10…28.8V DC for field power). Use the 37-pin D-shell connector for field wiring; ensure each output channel does not exceed 0.5 A and the common does not exceed 4.0 A. For input wiring, verify the on-state voltage is at least 9.6V DC and the off-state voltage is below 5V DC to guarantee correct logic state detection.
Maintenance and Reliability
The photocoupler isolation (1250V AC rms) protects the logic side from field transients. Periodically inspect the 37-pin connector for corrosion or loose pins, especially in humid environments. The module's power dissipation is low (1.2 W max at 28.8V DC), so no forced cooling is typically required, but ensure ambient temperature stays within the module's unspecified range — consult the manual for exact limits.
CompactBlock LDX Base Module for Reliable I/O Control
The Allen-Bradley 1790-8BV8VX is a CompactBlock LDX base module that integrates 8 universal inputs and 8 sinking outputs in a single 24V DC unit. Designed for distributed control architectures, this module reduces wiring complexity and cabinet space while delivering deterministic I/O performance. Its nonisolated design with photocoupler isolation ensures signal integrity in electrically noisy industrial environments.
Compatibility and Integration
The 1790-8BV8VX uses DeviceNet for communication and power, making it a natural fit for Rockwell Automation architectures. It integrates with CompactLogix, ControlLogix, and other DeviceNet scanners. The nonisolated DeviceNet power simplifies wiring but requires careful grounding to avoid ground loops. For expansion, additional CompactBlock LDX modules can be connected via the built-in expansion interface.
Selection Guide and Purchasing Advice
When selecting this module, confirm your system voltage matches the 24V DC nominal field power. For applications requiring more than 8 outputs, consider pairing with expansion modules. AutoDCSTech stocks the Allen-Bradley 1790-8BV8VX and can advise on lifecycle status and availability. Contact our team to verify stock and lead times before ordering.
Availability & Condition at AutoDCSTech
| Part Number | 1790-8BV8VX |
|---|---|
| Availability | In Stock |
| Condition | New |
| Warranty | One Year |
| Origin | US |
